Generator Sizing Calculator
Size a backup generator based on your critical loads. Compare portable vs. standby, fuel types, costs, and runtime for any outage scenario.
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Generators That Fit Your Load
Generator vs. Battery Backup
| Metric | You | US Avg |
|---|---|---|
| Equipment cost | $600 | $24,150 (3× battery, after ITC) |
| Fuel cost per outage | $27 | $0 (solar rechargeable) |
| Auto-start? | No (manual) | Yes |
| Run time | Unlimited (with fuel) | 31 hrs |
| Noise | 72 dB | Silent |
| Maintenance | Oil, filters, fuel stabilizer | None |
Sizing rule: Total running watts + 20% headroom. Ensure surge capacity covers startup loads (motors draw 2–3× running watts momentarily).
Safety: Never run a generator indoors or in an enclosed garage. Use a transfer switch for permanent connections — never backfeed through a wall outlet.
Fuel storage: Gasoline keeps 3–6 months with stabilizer. Diesel keeps 6–12 months. Propane keeps indefinitely. Natural gas has unlimited supply.
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